The AirDog and AirDog II systems removes entrained air/vapor from diesel fuel which improves engine performance by maintaining correct injection timing, eliminating spray pattern disruption, allowing for a full power stroke and complete burn. This leads to increased fuel economy, increased power output, increased torque output, longer injector life, improved throttle response, reduced exhaust emissions and optimized engine performance. The AirDog II also overcomes loss of power for diesel engines operating at higher altitudes. Also, if you are looking to just upgrade your factory lift pump, check out the Raptor lift pump by AirDog.